A look at the mp3 and how its system works

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A look at the mp3 and how its system works

A CD stores a song as digital information. The data on a CD uses an uncompressed, high-resolution format.

Music is sampled 44, times per second. The samples are 2 bytes 16 bits long. Separate samples are taken for the left and right speakers in a stereo system. So a CD stores a huge number of bits for each second of music: If an average song is three minutes long, then the average song on a CD consumes about 32 million bytes or 32 megabytes of space.

Even with a high-speed cable or DSL modem, it can take several minutes to download just one song. Over a 56K dial-up modemit would take close to two hours.

The MP3 format is a compression system for music. The goal of using MP3 is to compress a CD-quality song by a factor of 10 to 14 without noticeably affecting the CD-quality sound.

Is it possible to compress a song without hurting its quality? We use compression algorithms for images all the time. To make a good compression algorithm for sound, a technique called perceptual noise shaping is used.

There are certain sounds that the human ear cannot hear. There are certain sounds that the human ear hears much better than others.

If there are two sounds playing simultaneously, we hear the louder one but cannot hear the softer one. Using facts like these, certain parts of a song can be eliminated without significantly hurting the quality of the song for the listener. Compressing the rest of the song with well-known compression techniques shrinks the song considerably -- by a factor of 10 at least.

The MP3 version of the song does not sound exactly the same as the original CD song because some of it has been removed. Not all MP3 files are equal.Late update.

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Switch on your iPod to play your favorite track and it works just like a computer. The processor chip loads an MP3 file, reads the ID3 index cards, and displays the artist and track name on the display. Next, it works its way through the MP3 file reading each frame in turn.

How does Bluetooth work? Share on Facebook. Share on Twitter all using the same core system. The Bluetooth RF transceiver (or physical layer) operates in the unlicensed ISM band centered at 2. The MP3 Format - The MP3 format is a compression system for music. Read about music sampling and whether the MP3 format can compress a song without hurting its quality.

My SanDisk M MP3 player works on my business laptop (so I know the unit is operational) but not my home desktop. However, all other USB devices work perfectly on the desktop: keyboard, mouse, webcam, printer, removable drives, etc.

A look at the mp3 and how its system works

History of the MP3 player. The MP3 project began in in Germany, and the patent for its use was finally granted in The first MP3 player was produced in Korea in Apple produced the iPod in It has since become the most popular MP3 player in the world, although it actually converts MP3 files into its own file format.

How MP3 Files Work | HowStuffWorks